[analysis_server] Update to v3.18 of the LSP spec To aid reviewing, I'm splitting this into two patch sets: Patch set 1 is the manual changes I made to update the version of the LSP spec we pull and fix up any analysis errors/test failures related to it. Patch set 2 is the generated code changes and the updated copy of the spec. There shouldn't be any functional changes here, the LSP spec just has both new types, and improved representations of existing types (or new names attributed to what were previously anonymous types that we generated names for). Fixes https://github.com/dart-lang/sdk/issues/63608 Change-Id: I71379078a407f8e4f2966b3656d1b13064c98cf9 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/514500 Reviewed-by: Keerti Parthasarathy <keertip@google.com> Commit-Queue: Samuel Rawlins <srawlins@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
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